Add Ruby 2.1.2 patches.
Don't install libyaml-dev with Ruby 2.1 railsexpress.
Fix for resolv_conf recipe for 12.04+ with the resolvconf package installed.
Selectively enable patch 06 for Ruby 2.1+railsexpress when supported.
Merge pull request #205 from bryantraywick/pull-request-204

Ruby 2.1+railsexpress.